甜玉米自交系作测验种数目的研究

Studies on Inbred Lines of Sweet Corn as Tester and Number

选用 9个普甜玉米 (ZeamaysL saccharataSturt)自交系作测验种 ,用新选育的 10个普甜玉米自交系作待测系 ,采用NCⅡ交配设计和相关分析的方法 ,对待测系的配合力测定中测验种最少数目进行研究。结果表明 :若对测验种加以筛选 ,被筛选出的测验种只用其中一个 ,就能较准确地测定待测系的产量一般配合力 (GCA) ;若对测验种不加筛选 ,则能够准确地测定待测系产量GCA的最少测验种数目为 3个。对 8个农艺性状进行测验种测定效果评价时 ,株高、生育期、穗重、穗长、穗粗、行粒数及千粒重对测验种的选择不太严格 ;

To select inbred lines of sweet corn( Zea mays L saccharata Sturt)as testers by means of North Carolina DesignⅡ(NCⅡ),9 inbred lines of sweet corn as testers,10 new inbred lines of sweet corn as tested lines have been studied The results indicate that GCA effect for grain yield of inbred lines can be tested accurately by one selected tester and at least 3 testers are needed when not selecting It's practical to use inbred lines beyond 3 as testers to estimate GCA effect for grain yield of inbred lines Evaluating effectiveness of 8 agronomic characctcteristics of testers,plant height,ear length,ear weight,ear diameter,kernels per row 1000 kernels weight,and growth stages for testers selecting are not strict except bare tip length,cob diameter and kernel percent